Please read these instructions before posting any event on Fermilab Indico

Indico search will be reestablished in the next version upgrade of the software:


This search is only for public events. Restricted events are not available.

June 22, 2020 to July 2, 2020
US/Central timezone

Bayesian analysis of Project 8's sensitivity to the neutrino mass scale and ordering

Not scheduled


Talia Weiss (Massachusetts Institute of Technology)


Project 8 aims to determine the absolute neutrino mass scale from a tritium beta spectrum using Cyclotron Radiation Emission Spectroscopy (CRES). Bayesian analysis is suited for direct mass measurements because it incorporates non-Gaussian features—like the mass's physical bound at zero—without invoking approximate interval building techniques. Bayesian methods also separate inference from result-reporting, revealing how both affect accuracy. Project 8 devised a new Bayesian beta spectrum model and applied it to the first CRES tritium spectrum. We analyze pseudo-spectra with this model, then observe how often the inferred mass scale and hierarchy agree with "truths." 90% credible intervals contain the true mass in $>$90% of analyses, validating our model. For a design under consideration, we find Project 8 can achieve its goal of measuring $m_\beta$ within 40meV with $\sim$1 year of data. Masses $>$500meV can be measured within 90% intervals of width ≈5meV.


Bayesian study shows Project 8 can measure $m_\beta$ within 40meV (90% C.I.) with ~1 year of data.

Experiment/Collaboration Project 8

Primary author

Talia Weiss (Massachusetts Institute of Technology)

Presentation Materials